Add Tooltip Explaining Size Abbreviations

[AlexGilleran]

Description

Currently for files that are drag-dropped onto the Add Dataset flow, we display size as KiB/MiB etc - this is more precise (see https://www.majordifferences.com/2018/03/differences-between-megabyte-and.html), but to the uninitiated looks like a typo. We should add a help tip that explains this.

Technical Notes

There are already existing tips - they look like (!) - in the UI. We should just reuse whatever we've done for them in this task. If there's not already a reusable component for these we should create one.

Acceptance Criteria

• Every potential instance of MiB / KiB / etc has a tooltip nearby that explains the megabyte / mebibyte difference.

Updated: on 1st Nov

• the tooltip should be a mouseover one
• We only need to update add dataset page. Don't need to worry about Admin-ui for this ticket